Clifty Creek Power Plant is a 1.3- GW coal-fired power station located at 38°44′16″N 85°25′08″W ﻿ / ﻿ 38.73778°N 85.41889°W ﻿ / 38.73778; -85.41889 Coordinates: 38°44′16″N 85°25′08″W ﻿ / ﻿ 38.73778°N 85.41889°W ﻿ / 38.73778; -85.41889 in Madison, Indiana, USA. Five of its six identical units began operating in 1955, the sixth unit was launched in 1956. It has one of the tallest chimneys in the world, at 300 metres (980 ft).

Environmental impact With all of its units dating back to mid-1950s, the plant ranked 49 th on the United States list of dirtiest power plants in terms of sulphur dioxide emissions per megawatt-hour of electrical energy produced in 2006.